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Diss Factsheets

Physical & Chemical properties

Boiling point

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2016
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
no guideline followed
Principles of method if other than guideline:
- Principle of test: The method uses a vacuum ebuliometer, in which the sample is contained within a 250 cm^3 3 neck round bottom flask placed within a heating mantle. The 3 necks enable connections to temperature and pressure measurement devices and the vacuum system. Observations of boiling point temperature are taken over a range of pressures and the boiling point of the sample at a pressure of 760 mm of mercury calculated using the Clapeyron-Clausius equation. It is also possible to calculate the latent heat of evaporation of the test material from this data.
GLP compliance:
no
Type of method:
ebulliometer
Key result
Boiling pt.:
138 °C
Atm. press.:
760 mm Hg
Boiling pt.:
33 °C
Atm. press.:
10 mm Hg
Boiling pt.:
53 °C
Atm. press.:
29 mm Hg
Boiling pt.:
74 °C
Atm. press.:
75 mm Hg
Boiling pt.:
90 °C
Atm. press.:
144 mm Hg
Boiling pt.:
103 °C
Atm. press.:
237 mm Hg
Boiling pt.:
118 °C
Atm. press.:
405 mm Hg
Boiling pt.:
126 °C
Atm. press.:
527 mm Hg
Boiling pt.:
133 °C
Atm. press.:
654 mm Hg
Boiling pt.:
137 °C
Atm. press.:
750 mm Hg
Conclusions:
The boiling point at 760 mm Hg was found to be 138 °C.
Executive summary:

The method to determine the boiling point uses a vacuum ebuliometer, in which the sample is contained within a 250 cm^3 3-neck round bottom flask placed within a heating mantle. The 3 necks enable connections to temperature and pressure measurement devices and the vacuum system. Observations of boiling point temperature are taken over a range of pressures and the boiling point of the sample at a pressure of 760 mm of mercury calculated using the Clapeyron-Clausius equation. It is also possible to calculate the latent heat of evaporation of the test material from this data. These results give a boiling point at 760 mm Hg of 138 °C and a molar enthalpy of evaporation of 42.98 kJ.

Description of key information

The method uses a vacuum ebuliometer, in which the sample is contained within a 250 cm^3 3-neck round bottom flask placed within a heating mantle. The 3 necks enable connections to temperature and pressure measurement devices and the vacuum system. Observations of boiling point temperature are taken over a range of pressures and the boiling point of the sample at a pressure of 760 mm of mercury calculated using the Clapeyron-Clausius equation. It is also possible to calculate the latent heat of evaporation of the test material from this data. These results give a boiling point at 760 mm Hg (equivalent to 101,325 Pa) of 138 °C and a molar enthalpy of evaporation of 42.98 kJ.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
138 °C

Additional information